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- /* Copyright (C) 2014 Stony Brook University
- This file is part of Graphene Library OS.
- Graphene Library OS is free software: you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public License
- as published by the Free Software Foundation, either version 3 of the
- License, or (at your option) any later version.
- Graphene Library OS is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- /*
- * shim_getcwd.c
- *
- * Implementation of system call "getcwd", "chdir" and "fchdir".
- */
- #include <errno.h>
- #include <pal.h>
- #include <pal_error.h>
- #include <shim_fs.h>
- #include <shim_handle.h>
- #include <shim_internal.h>
- #include <shim_table.h>
- #include <shim_thread.h>
- #include <shim_utils.h>
- #ifndef ERANGE
- #define ERANGE 34
- #endif
- int shim_do_getcwd(char* buf, size_t len) {
- if (!buf || !len)
- return -EINVAL;
- if (test_user_memory(buf, len, true))
- return -EFAULT;
- struct shim_thread* thread = get_cur_thread();
- assert(thread);
- struct shim_dentry* cwd = thread->cwd;
- size_t plen;
- const char* path = dentry_get_path(cwd, true, &plen);
- int ret;
- if (plen >= MAX_PATH) {
- ret = -ENAMETOOLONG;
- } else if (plen + 1 > len) {
- ret = -ERANGE;
- } else {
- ret = plen + 1;
- memcpy(buf, path, plen + 1);
- }
- return ret;
- }
- int shim_do_chdir(const char* filename) {
- struct shim_thread* thread = get_cur_thread();
- assert(thread);
- struct shim_dentry* dent = NULL;
- int ret;
- if (!filename)
- return -EINVAL;
- if (test_user_string(filename))
- return -EFAULT;
- if (strnlen(filename, MAX_PATH + 1) == MAX_PATH + 1)
- return -ENAMETOOLONG;
- if ((ret = path_lookupat(NULL, filename, LOOKUP_OPEN, &dent, NULL)) < 0)
- return ret;
- if (!dent)
- return -ENOENT;
- if (!(dent->state & DENTRY_ISDIRECTORY)) {
- debug("%s is not a directory\n", dentry_get_path(dent, false, NULL));
- put_dentry(dent);
- return -ENOTDIR;
- }
- lock(&thread->lock);
- put_dentry(thread->cwd);
- thread->cwd = dent;
- unlock(&thread->lock);
- return 0;
- }
- int shim_do_fchdir(int fd) {
- struct shim_thread* thread = get_cur_thread();
- struct shim_handle* hdl = get_fd_handle(fd, NULL, thread->handle_map);
- if (!hdl)
- return -EBADF;
- struct shim_dentry* dent = hdl->dentry;
- if (!(dent->state & DENTRY_ISDIRECTORY)) {
- debug("%s is not a directory\n", dentry_get_path(dent, false, NULL));
- put_handle(hdl);
- return -ENOTDIR;
- }
- lock(&thread->lock);
- get_dentry(dent);
- put_dentry(thread->cwd);
- thread->cwd = dent;
- unlock(&thread->lock);
- put_handle(hdl);
- return 0;
- }
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